G1 – Minor Geomagnetic Storm Watch issued for October 31 and November 1, 2026

A G1 – Minor Geomagnetic Storm Watch has been issued, valid for October 31 and November 1, 2026, according to NOAA’s Space Weather Prediction Center (SWPC) alert issued on October 29, 2026 at 19:10 UTC. No storm conditions are predicted for October 30, with geomagnetic storming at G1 – Minor levels expected on October 31 and November 1. This Watch supersedes all previously issued watches for this period.

Potential impacts associated with a G1 – Minor Geomagnetic Storm primarily affect areas poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations may occur, and minor impacts to satellite operations are possible. High-latitude observers, including those in the northern tier of the United States such as northern Michigan and Maine, may have opportunities to observe visible auroras during this event.

The triggering event for this watch is the anticipated arrival of a recurrent, equatorial, positive polarity coronal hole high speed stream (CH HSS) beginning late on October 30 and continuing into October 31. Solar activity remains very low, with no significant flare activity reported. Solar wind enhancements from the CH HSS are expected to drive unsettled to active geomagnetic conditions, making G1 – Minor geomagnetic storming likely on October 31, according to the latest SWPC forecast discussion.